Well-defined donor-acceptor rod-coil diblock copolymer based on P3HT containing C60

a donor-acceptor rodcoil and copolymer technology, applied in the field of organic photovoltaic devices, can solve the problems of limited success of this approach, and achieve the effect of improving performance and efficiency

Inactive Publication Date: 2012-07-03
RGT UNIV OF CALIFORNIA
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  • Abstract
  • Description
  • Claims
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Benefits of technology

[0007]The present invention overcomes the foregoing drawbacks. In contrast to the above-described, a process for the synthesis of a block copolymer is now provided containing a C60 derivative that shows exclusively a nanofibrilar structure. Also provided are devices with improved performance and efficiency when the block copolymer is used as a “surfactant” for controlling the interface morphology of the P3HT:PCBM donor-acceptor phase domains within the composite.

Problems solved by technology

Reports on rod-coil block copolymers based on P3HT rod and polyolefin coil by using living radical polymerization techniques have established the existence of nanofibrilar structures in the solid state.24-28 Although there are reports of synthesis directed toward soluble donor-acceptor rod-coil diblock copolymers containing C60 for use as the active layer in solar cells,29-32 the difficulty in removing unreacted C60 has limited the success of this approach.

Method used

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  • Well-defined donor-acceptor rod-coil diblock copolymer based on P3HT containing C60
  • Well-defined donor-acceptor rod-coil diblock copolymer based on P3HT containing C60
  • Well-defined donor-acceptor rod-coil diblock copolymer based on P3HT containing C60

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Embodiment Construction

[0030]Among various living polymerization methods, reversible addition fragmentation chain transfer (RAFT) was selected for the synthesis of the rod-coil block copolymer containing polyolefin since it does not involve the use of a transition metal catalyst.33,34 This protocol is applicable to a whole range of monomers.35 The synthetic method is outlined in FIG. 1. The polymerization of 2,5-dibromo-3-hexylthiophene was performed by (GRIM) reaction with i-PrMgCl.LiCl / nickel catalyst36, followed by the treatment of a second Grignard reagent (allyl magnesium bromide), resulting in the mono end-capped P3HT (Mn=8.3 kg / mol, PDI=1.11, against PS standard). This is a slight synthetic modification of McCullough's method.25 The allyl-mono-capped P3HT typically contained two populations, one major and one minor, which correspond to allyl / Br and allyl / H respectively.37 To completely rule out the halogen defect on electronic applications, the allyl / Br fractions in the polymer were debrominated by...

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Abstract

A method for the synthesis of well-defined rod-coil block copolymers consisting of P3HT donor and C60 acceptor chromophores (P3HT-b-P(SxAy)-C60) in a molecular architecture is reported for use in bulk-heterojunction (BHJ) solar cells. In thin films of the resulting block copolymer, reproducible self-assembly into well-defined “nanofibrils” is observed. This is the first example of a block copolymer containing a C60 derivative that shows exclusively a nanofibrilar structure. A substantial improvement in device performance is achieved when the block copolymer is used as a “surfactant” for controlling the interface morphology of the P3HT:PCBM donor-acceptor phase domains within the composite.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Patent Application No. 61 / 118,921 filed Dec. 1, 2008, which is hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The invention generally relates to organic photovoltaic devices (OPV) based on π-conjugated polymer and fullerene composites. More particularly, the invention relates to a process for the synthesis of and devices incorporating well-defined donor-acceptor rod-coil diblock copolymer based on P3HT containing C60 (P3HT-b-P(SxAy)-C60).BACKGROUND OF THE INVENTION[0003]Organic photovoltaic devices (OPV) based on π-conjugated polymer and fullerene composites, so-called “bulk heterojunction (BHJ)”, offer an intrinsically low-cost, scalable approach to photovoltaic technology.1,2 Important examples of materials used for fabricating BHJ solar cells include blends of thiophene-based polymers as electron-donors (D) and fullerene derivatives as a electron-acce...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08G75/00
CPCC08F293/005C08G61/126H01L51/0043H01L51/4253C08F2438/03C08G2261/126C08G2261/1642C08G2261/1644C08G2261/3223C08G2261/417Y02E10/549H10K85/151H10K30/30H10K30/50
Inventor YANG, CHANGDUKWUDL, FRED
Owner RGT UNIV OF CALIFORNIA
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